关于app.config不能即时保存读取的解决方案

public void saveValue(string Name, string Value)
{
    ConfigurationManager.AppSettings.Set(Name, Value);
    Configuration config = ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath);
    config.AppSettings.Settings[Name].Value = Value;
    config.Save(ConfigurationSaveMode.Modified);
    config = null;
}

用上面的函数总是等到程序运行结束，才将数据保存进去。

所以我们换了一种方式，以xml的方式进行保存及读取。直接上代码。

public static void SetAppConfig(string appKey, string appValue)
{
    XmlDocument xDoc = new XmlDocument();
    xDoc.Load(System.Windows.Forms.Application.ExecutablePath + ".config");

    var xNode = xDoc.SelectSingleNode("//appSettings");

    var xElem = (XmlElement)xNode.SelectSingleNode("//add[@key='" + appKey + "']");
    if (xElem != null) xElem.SetAttribute("value", appValue);
    else
    {
        var xNewElem = xDoc.CreateElement("add");
        xNewElem.SetAttribute("key", appKey);
        xNewElem.SetAttribute("value", appValue);
        xNode.AppendChild(xNewElem);
    }
    xDoc.Save(System.Windows.Forms.Application.ExecutablePath + ".config");
}

public static string GetAppConfig(string appKey)
{
    XmlDocument xDoc = new XmlDocument();
    xDoc.Load(System.Windows.Forms.Application.ExecutablePath + ".config");

    var xNode = xDoc.SelectSingleNode("//appSettings");

    var xElem = (XmlElement)xNode.SelectSingleNode("//add[@key='" + appKey + "']");

    if (xElem != null)
    {
        return xElem.Attributes["value"].Value;
    }
    return string.Empty;
}

使用方式

设置

SetAppConfig("SourceDBIP", txtSourceAddress.Text.Trim());

读取

Setting.GetAppConfig("SourceDBIP")